Evaluation of axial and flexural stresses in the vertebral body cortex and trabecular bone in lordosis and two sagittal cervical translation configurations with an elliptical shell model

Harrison, Deed E.; Jones, Eliot; Janik, Tadeusz J.; Harrison, Donald D.

doi:10.1067/mmt.2002.126128

Cited by 40 publications

(23 citation statements)

References 32 publications

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“…Harrison et al [14] have reported that the vertical load exerted to the vertebral body of the cervical spine was at least ten times stronger at the apex of kyphosis than that of Fig. 2 Case presentation.…”

Section: Discussionmentioning

confidence: 99%

Does the sagittal alignment of the cervical spine have an impact on disk degeneration? Minimum 10-year follow-up of asymptomatic volunteers

et al. 2009

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There have been few studies that investigated and clarified the relationships between progression of degenerative changes and sagittal alignment of the cervical spine. The objective of the study was to longitudinally evaluate the relationships among progression of degenerative changes of the cervical spine with age, the development of clinical symptoms and sagittal alignment of the cervical spine in healthy subjects. Out of 497 symptom-free volunteers who underwent MRI and plain radiography of the cervical spine between 1994 and 1996, 113 subjects (45 males and 68 females) who responded to our contacts were enrolled. All subjects underwent another MRI at an average of 11.3 years after the initial study. Their mean age at the time of the initial imaging was 36.6 ± 14.5 years (11-65 years). The items evaluated on MRI were (1) decrease in signal intensity of the intervertebral disks, (2) posterior disk protrusion, and (3) disk space narrowing. Each item was evaluated using a numerical grading system. The subjects were divided into four groups according to the age and sagittal alignment of the cervical spine, i.e., subjects under or over the age of 40 years, and subjects with the lordosis or non-lordosis type of sagittal alignment of the cervical spine. -009-1095-5 During the 10-year period, progression of decrease in signal intensity of the disk, posterior disk protrusion, and disk space narrowing were recognized in 64.6, 65.5, and 28.3% of the subjects, respectively. Progression of posterior disk protrusion was significantly more frequent in subjects over 40 years of age with non-lordosis type of sagittal alignment. Logistic regression analysis revealed that stiff shoulder was closely correlated with females (P = 0.001), and that numbness of the upper extremity was closely correlated with age (P = 0.030) and male (P = 0.038). However, no significant correlation between the sagittal alignment of the cervical spine and clinical symptoms was detected. Sagittal alignment of the cervical spine had some impact on the progression of degenerative changes of the cervical spine with aging; however, it had no correlation with the occurrence of future clinical symptoms.123 Eur Spine J (2009) 18:1644-1651 DOI 10.1007/s00586

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Section: Discussionmentioning

confidence: 99%

Does the sagittal alignment of the cervical spine have an impact on disk degeneration? Minimum 10-year follow-up of asymptomatic volunteers

et al. 2009

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“…There is evidence to suggest that increased magnitudes of AWB increases the stresses on the vertebral body and disks and likely leads to the development of cervical disk degenerative disease. 22 By eliminating significant degenerative disk disease we may have artificially eliminated large AWB postures of the head. Another explanation for the limited number of subjects with AWB of more than 40 mm is the exclusion of subjects with S-shaped cervical curvatures.…”

Section: Andmentioning

confidence: 99%

Determining the Relationship Between Cervical Lordosis and Neck Complaints

McAviney¹,

Schulz²,

Bock³

et al. 2005

Journal of Manipulative and Physiological Therapeutics

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“…1, 2). There is much discussion in the literature as to whether, from a biomechanical point of view, the loss of the physiological lordosis could be a possible cause of pain, due to muscular imbalance [34] or, in the case of kyphotic deformities, due to structural overload of the anterior parts of the spine [24,26]. Most of these studies have been in vitro experiments, although a recent study showed that, in individuals of around 40 years of age and with no kyphotic deformity, the mean cervical lordotic curve was lowest in a group with chronic neck pain and greatest in normal controls, with acute pain patients lying somewhere between the two [27].…”

Section: Introductionmentioning

confidence: 99%

The association between cervical spine curvature and neck pain

2006

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Degenerative changes of the cervical spine are commonly accompanied by a reduction or loss of the segmental or global lordosis, and are often considered to be a cause of neck pain. Nonetheless, such changes may also remain clinically silent. The aim of this study was to examine the correlation between the presence of neck pain and alterations of the normal cervical lordosis in people aged over 45 years. One hundred and seven volunteers, who were otherwise undergoing treatment for lower extremity problems in our hospital, took part. Sagittal radiographs of the cervical spine were taken and a questionnaire was completed, enquiring about neck pain and disability in the last 12 months. Based on the latter, subjects were divided into a group with neck pain (N = 54) and a group without neck pain (N = 53). The global curvature of the cervical spine (C2-C7) and each segmental angle were measured from the radiographs, using the posterior tangent method, and examined in relation to neck complaints. No significant difference between the two groups could be found in relation to the global curvature, the segmental angles, or the incidence of straight-spine or kyphotic deformity (P > 0.05). Twenty-three per cent of the people with neck pain and 17% of those without neck pain showed a segmental kyphosis deformity of more than 4°in at least one segment-most frequently at C4/5, closely followed by C5/6 and C3/4. The average segmental angle at the kyphotic level was 6.5°in the pain group and 6.3°i n the group without pain, with a range of 5-10°in each group. In the group with neck pain, there was no association between any of the clinical characteristics (duration, frequency, intensity of pain; radiating pain; sensory/motor disturbances; disability; healthcare utilisation) and either global cervical curvature or segmental angles. The presence of such structural abnormalities in the patient with neck pain must be considered coincidental, i.e. not necessarily indicative of the cause of pain. This should be given due consideration in the differential diagnosis of patients with neck pain.

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Evaluation of axial and flexural stresses in the vertebral body cortex and trabecular bone in lordosis and two sagittal cervical translation configurations with an elliptical shell model

Cited by 40 publications

References 32 publications

Does the sagittal alignment of the cervical spine have an impact on disk degeneration? Minimum 10-year follow-up of asymptomatic volunteers

Does the sagittal alignment of the cervical spine have an impact on disk degeneration? Minimum 10-year follow-up of asymptomatic volunteers

Determining the Relationship Between Cervical Lordosis and Neck Complaints

The association between cervical spine curvature and neck pain

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